Why this one
Built for the person doing the job
Yellow cells are the ones you type in. Grey cells fill themselves in and are guarded, so you cannot wipe one by accident. Nothing is locked, and every dropdown lets you type something that is not on its list.
A full sample year is already in it, and it is deliberately imperfect: one job is five people short, one parent declined, one did not turn up, and one job is a person over. You see every color before it is your event.
Room for 300 volunteers, 50 events, 200 shifts and 800 assignments. That is written on the Start Here tab too, because you should not find out a limit by hitting it.
Reuse it every school year. File, Make a copy, and your people and job names come with it while last year stays intact as the record.